Engineer s instructor



(No Model.) 2 Sheets-Sheet 2.

R. J. SCHWAB, C. A. SBRCOMB & J. K. TREMAIN.

ENGINBBRS INSTRUCTOR.

No.- 508,247. PatentedNov. '7, 1893..

1 i lq. p s

Fig. 5 is a transverse vertical section on thel IIN-HBD' STATES PATENT Finca.

RUDOLPH J. SCHWAB, CHARLES A. SERCOMB, AND JAMES K. TREMAIN= OF MILWAUKEE, WISCONSIN.

ENc|NEERs lN-sTRUcToR.

SPECIFICATION forming part of Letters Patent No. 508,247, dated November 7, 1893.

Appucmbn fuednty 24, 189e.

To all whom t may concern:

' Be it known that we, RUDOLPH J. SCHWAB, CHARLES A. SERCOMB, and JAMES K. TRE- MAIN, all of Milwaukee, in the county of Milwaukee, and in the State of Wisconsin, have invented certain new and useful Improvements in Engineers Instructors; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to appliances for illustrating the mechanical action of steam engines, and our invention consists in certain' peculiar and novel features of construction and arrangement, as hereinafter described and pointed out in the appended claim.

In order that our invention may be fully understood, we will proceed to describe it with reference'to the accompanying drawings, in

whichn Figure l is a side elevation of a machine constructedin accordance with ourinvention. Fig. 2 is a plan view of the same. Fig. 3 is a side elevation of the linkmotion and the adjacent part of the supporting frame therefor; thisview being partly in section on the line 3-3 of Fig. 2. Fig. is a similar view of the reverse side of the cylinder, steamchest, and guide portions of the machine.

line 5-5 of Fig. 4. Fig. 6 is an oblique cross- Section onthe line 6,-'6 ofQFig. 3.

The objects of our invention are, to pro-` duce va working diagram-model which shall clearly illustrate the construction, `arrangement and actual movements of the various parts of a locomotive engine, and also the various adjustments of the reversing-lever and link-motion necessary to reverse the engine, and to vary, the lead of the valve so as to controlfthe steam cut-oft and exhaust. These objects We attain by virtue of the construction which we will now proceed to. describe.

In the drawings A` designates the base of the machine upon which the frame-work which supports the moving parts is mounted.

This frame-work is preferably composed of two-fiat elongated vertical sections B, C, connected together at the lower and upper parts respectivelyof their contiguous ends by screwbolts D and E, as shown in Figs. l and 2. At

Serial No. 353,025. (No model.)

its outer end the section B is formed with a vertical extension F having a central horizontal cross-piece f, an'd,at its upper end, a segmental slot f. 'Adjacent to the inner side of this vertical extension F is formed a second Vertical extension G, and at the inner end ot' the frame-section B is formed a Vertical L-shaped extension H. Upon the crosspiece f is pivoted the lower end of a lever I which carries at its upper portion a set-screw t the stem of which works through the segmental slot f. A link J is connected at its rear end to the lever I at a point between its pivot and its set-screw t' and the front end of this lever is connected tothe upper arm k of a bell-crank lever K. This bell-crank lever is pivoted upon a stud k2 at the inner upper corner of the extensionH. The lopposite arm lc of lever K is pivotally 'connected to the upper end of alink L, the lower end of which is pivoted to a 'bridge-piece m spanning the segmental slot of the quadrant-link M.

' The extension G is formed with a boss g which forms the bearing for a short shaft N upon the front end of which is cast, keyed or otherwise similarly secured a wheel O,which is thus adjacent to the front side of the frame section B. That part of the shaft N which protrudes beyond the rear side of the frameextension G is supported in a bearing G rising from section B, and carries two eccentrics P, P', the straps p, p', of which are Vconnected b vrods p2, p3, respectively with the lower and upper parts of the quadrant-link M. From this description it Will be seen that the framesection B and the movable parts carried thereby closely simulate the carrying and controlling parts of a locomotive engine. For example, the wheel O represents one of the drivers ofthe engine,'N one ot' the driving axles, P, P', the usual eccentrics of the main driving axle; L the usual link'hang'er; K one of the usual liftingv arms, and I the usual reversing lever, &c. 9 5 y The outer end of the frame-section C is formed at its base with two wheel-like portions c, c, and immediately above these portions with a rearwardly sunken horizontally elongated panel Q. Above this latter portion Q is formed an approximately oblong rectangular horizontal extension R. A horizontal IOO portion S, containing a longitudinal slot s, connects the middle of the inner end of portion Q with the inner end of the frame-section C, and the upper corner of the inner end of this section C is formed with an offset c. Upon this ott-set c is pivoted a rocking lever S the lower end of which is pivotally connected to a block m in the quadrant-link M.

The portion Q of the frame-section C is designed to simulate a steam cylinder, divided longitudinally, and the portion R of said section is likewise designed to simulate a steamchest. A holet at the juncture of the portions Q and R represents the exhaust port; curved grooves t', t2, represent the inlet ports from the steam-chest to the cylinder and a groove t3 in the upper part of the front side of portion R represents the balance port. A flat plate Uslides across the portion R and is formed to simulate a D or slide-valve, and an extension u ot' one end of the plate U represents the valve stem. This extension u works through an oi-set u formed on the inner edge of the portion R to represent the usual stuffing boX, and the outer end of said extension is connected to a rod V which represents the usual valve rod. The opposite end of this rod is pivotally connected to the upper end of the rocking-lever S. A fiat plate W which slides across the portion Q of the frame-section is formed to simulate the usual piston-head and an extension w of this plate represents the usual piston-rod. This rod works through an ott-set r representing the usual stufting box of the cylinder and to the outer end of this extension wis pivotally connected one end of a bar X which represents one of the main driving rods of a locomotive engine. The opposite end ot' this bar X surrounds a pin 0 on the wheel O, said pin serving as a handle by which the wheel is turned to operate the moving parts of the machine. A lug w' projects through the slot s and a pin to2 passesvertically through this lug and serves to retain the extension w and plate W in proper relation to the adjacent parts of the frame-section C during the movements of said plate and extension. A lug u2 projects similarly through a slot us in the portion R, and carries apin us which retains the extension u and plate U in proper working position relative to the part R of the framesection C. A spring y is secured at its lower end in a lug Y upon the reverse side of the trame-portion Q and the upper end of this spring isstruck by an extension n4 on lng u2 as the plate U is moved back and forth. The relative positions of these parts are such that when the plate arrives at the exhaust points ofits movements the spring y will be vibrated by said extension a4 and thus give an audible report of the exhaust.

From the above description it will be seen that we have produced a machine (which we call an instructor the various parts of which bear close resemblance and occupy analogous positions to the operative parts of a locomotive engine. This machine, consequently, serves as a valuable adjunct to the training of locomotive engineers or others desiring to educate themselves for that business.

A very important feature of our device lies in the adjustable connections between the eccentric-straps p p and rods 132193, best shown in Fig. 3, said straps having grooved extensions p4, and the adjacent ends of the rods p2 p3 being provided with slots p5, so as to be adjustably held at any desired point within the grooved extensions p4, by set-screws p6, and thereby to equalize the travel of the slide-valve or [iat-plate U, over the grooves t t2 which represent the steam ports.

Our device belongs to that class of inventions which includes Patent N o. 46 1,7 7:2,granted to Miller and Hill, known as link-valvemotion models and like that device ours is intended to prod nce an audible sound, though by somewhat different means.

Having thus described our invention, what we claim as new therein, and desire to secure by Letters Patent, is-

In an improved educational appliance, consisting of a working diagrammatic model of an engine, the moving parts of such engine being simulated by moving parts ofthe model,the combination of a rearwardly sunken horizontally elongated panel, with an approximately oblong rectangular horizontal extension, provided with a longitudinal groove on one side with a slot through said groove, a flat spring secured edgewise to the rear side of said panel and projecting up in line with said slot, and an arm connected to the described moving parts ot' the device, and slidingin said groove, and carrying a pin projecting through said slot and intermittingly in contact with the top edge of said spring, substantially as set forth.

In testimony that we claim the foregoing we have hereunto set our hands, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence of two witnesses.

RUDOLPH J. SCHWAB. CHARLES A. SERCOMB. JAMES K. TREMAIN.

Vitn esses:

H. G. UNDERWOOD, LAWSON SCOTT.

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